Example of safe access using a string for the Safe Access Proxy article

StringBasedAccess.js

const DarthVader = {
  name : 'Anakin',
  mother : {
    name : 'Shmi'
  }
};

function deepAccessUsingString(obj, key){
  return key.split('.').reduce((nestedObject, key) => {
    if(nestedObject && key in nestedObject) {
      return nestedObject[key];
    }
    return undefined;
  }, obj);
}

let mothersName = deepAccessUsingString(DarthVader, 'mother.name');
let fathersName = deepAccessUsingString(DarthVader, 'father.name');
  
console.log(mothersName); // prints "Shmi"
console.log(fathersName); // prints undefined